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rule win_unidentified_104_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.unidentified_104." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.unidentified_104" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { 4c8d0d20070100 33c9 4c8d050f070100 488d1510070100 e8???????? 4885c0 } // n = 6, score = 100 // 4c8d0d20070100 | dec ecx // 33c9 | mov eax, dword ptr [edx + 0xa0] // 4c8d050f070100 | dec ecx // 488d1510070100 | mov ecx, edx // e8???????? | // 4885c0 | dec ecx $sequence_1 = { 4c03e9 4d33cd 498bd9 49c1e918 48c1e328 4933d9 4803c3 } // n = 7, score = 100 // 4c03e9 | xor edi, eax // 4d33cd | dec eax // 498bd9 | mov edx, edi // 49c1e918 | dec eax // 48c1e328 | shl edi, 0x20 // 4933d9 | dec eax // 4803c3 | shr edx, 0x20 $sequence_2 = { 410fb6401b 4c0bc8 410fb6401a 49c1e108 4c0bc8 49c1e104 4c03c9 } // n = 7, score = 100 // 410fb6401b | cmovae edx, dword ptr [ebp + 0x20] // 4c0bc8 | dec eax // 410fb6401a | mov eax, 0x53c0af84 // 49c1e108 | out dx, al // 4c0bc8 | xchg eax, edx // 49c1e104 | push -0x51 // 4c03c9 | dec eax $sequence_3 = { 48c1e128 4933c9 4c8b8c2490000000 498b8180000000 4803c1 4803e8 4c33c5 } // n = 7, score = 100 // 48c1e128 | dec eax // 4933c9 | mov dword ptr [ebx], eax // 4c8b8c2490000000 | dec eax // 498b8180000000 | mov eax, ebx // 4803c1 | dec eax // 4803e8 | add esp, 0x20 // 4c33c5 | dec eax $sequence_4 = { 4883fa10 0f8288000000 48ffc2 488b4dc7 488bc1 483bd7 728f } // n = 7, score = 100 // 4883fa10 | dec eax // 0f8288000000 | add eax, ecx // 48ffc2 | dec ecx // 488b4dc7 | lea ecx, [edx + 0x1000000] // 488bc1 | dec esp // 483bd7 | add ecx, eax // 728f | dec eax $sequence_5 = { 415d 415c 5f 5e 5d c3 488d5ed8 } // n = 7, score = 100 // 415d | mov ebx, 0x31 // 415c | mov edi, ebx // 5f | dec eax // 5e | lea edx, [ebp - 0x29] // 5d | dec eax // c3 | lea ecx, [ebp - 0x29] // 488d5ed8 | mov edi, 2 $sequence_6 = { 418848fe c1e810 c1e918 418800 41884801 4d8d4004 4983e901 } // n = 7, score = 100 // 418848fe | dec eax // c1e810 | lea ecx, [esp + 0x70] // c1e918 | add cl, byte ptr [ebp + 0x4b] // 418800 | mov byte ptr [ebp + 0x41], al // 41884801 | dec ecx // 4d8d4004 | mov eax, esi // 4983e901 | mov byte ptr [ebp + 0x42], cl $sequence_7 = { e8???????? 33c0 4883c420 5b c3 8bd3 488bc8 } // n = 7, score = 100 // e8???????? | // 33c0 | shl cl, 6 // 4883c420 | shr al, 2 // 5b | and al, 0xf // c3 | add al, dl // 8bd3 | add cl, byte ptr [ebp + 0x4b] // 488bc8 | mov dl, byte ptr [ebp + eax + 0x40] $sequence_8 = { 49c1e330 4c33da 4903f3 4889b424a0000000 4833ce 488b742418 488bd1 } // n = 7, score = 100 // 49c1e330 | lea eax, [ecx + ecx] // 4c33da | dec esp // 4903f3 | xor esp, eax // 4889b424a0000000 | dec ecx // 4833ce | mov eax, dword ptr [esi + 0x70] // 488b742418 | dec ecx // 488bd1 | xor ecx, ecx $sequence_9 = { 7230 48ffc2 488b8dc0000000 488bc1 4881fa00100000 7215 } // n = 6, score = 100 // 7230 | dec ecx // 48ffc2 | xor ecx, ecx // 488b8dc0000000 | dec esp // 488bc1 | mov dword ptr [esp + 0x20], ecx // 4881fa00100000 | dec esp // 7215 | mov ecx, ecx condition: 7 of them and filesize < 263168 }
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